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conflict with fundamental physics?

I just need help in physics. That's the basics, but I can-1. if a bike with a mass of 250 kg has a kinetic energy of 200,000 J, what is the speed of motorcycles in m / s? which is 400 m / s, right? 2. the force of gravity on Mars is 3.7 m / s ^ 2. If an astronaut on Mars raises a rock 1m 10 kg of soil, just to see what is applicable, the amount of work carried astronaut? Because I am a 10D but I think I'm wrong, because the whole thing serious. if someone could just say what formula I'm supposed to use, it would be cool. 3. 100 workers to obtain a block of three tons to 100 m high with a ramp with a mechanical advantage of 4. each lift, each worker has 50J of work anywhere. How does for workers to get the block in either the height of the ramp? (Note-1ton N = 8896), confuses me, I do not know exactly what the math or formulas that are supposed to do. Again, if anyone can explain this ..?

1. 1/2mv KE = ^ =. 2200000 5 * 250 * 2 ^ vv = 40 m / s you really a factor of 10. Can be 20,000 instead? 2. W = mg = ΔPE ΔPE (H1-H2) So now, Givens is: W = 10 kg (3.7) (1 m) W = 37 3 J. mechanical advantage = Length / Height inclined Length = 4 / 100 Length = 400m This amount is not really important, but it's good to know for the future, I guess. However, the mechanical advantage of 4 means that we need a net force is equal to 1 / 4 block to move weight. Using again our faithful equations: * WNET F = D where D is the height of the box lift (100 meters) F is obtained by dividing the weight given by 4 = 667 200 J WNET Now the problem indicates that you have 100 guys who contribute by lifting each 50J. This means that the 100 * 50 = 5000 J input lifting work. 667200 / 5000 = 133.44 *** filming had to make a small correction there. Word that was 3 tons instead of just one tonne of force has changed a little *** I hate problems like this mechanical advantage type, je

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